Hyper-V Time Synchronization Service (vmictimesync) Defaults in Windows 10

Synchronizes the system time of this virtual machine with the system time of the physical computer.

Default Settings

Startup type:Manual
Display name:Hyper-V Time Synchronization Service
Service name:vmictimesync
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\system32\svchost.exe -k LocalServiceNetworkRestricted
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vmictimesync
  • SeChangeNotifyPrivilege
  • SeSystemtimePrivilege
  • SeCreateGlobalPrivilege

Default Behavior

Hyper-V Time Synchronization Service is a Win32 service. In Windows 10 it is starting only if the user, an application or another service starts it. When the Hyper-V Time Synchronization Service is started, it is running as NT AUTHORITY\LocalService in a shared process of svchost.exe along with other services. If Hyper-V Time Synchronization Service fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the vmictimesync service has failed to start due to the error.


Hyper-V Time Synchronization Service cannot be started under any conditions, if the Microsoft Hyper-V Guest Infrastructure Driver service is disabled.

Restore Default Startup Configuration for Hyper-V Time Synchronization Service

1. Select your Windows 10 edition and release, and then click Download.

2. Save the Win10_vmictimesync_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The vmictimesync service is using the icsvc.dll file that is located in the %WinDir%\System32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.